Mechpro Engineers

For the Sany SR235 rotary drilling rig, the "Kelly Spring" (often referred to as the Kelly Bar cushioning spring or shock absorber spring) is a heavy-duty component located at the bottom of the Kelly bar or within the pulley yoke assembly. Its primary purpose is to absorb high-impact loads and vibrations during drilling, specifically when the interlocking Kelly bar locks or unlocks against the rotary drive.